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2007 Alum Rock earthquake

2007 earthquake in the San Francisco Bay Area, California, United States

Field	Value
title	2007 Alum Rock earthquake
local-date
local-time	20:04 PDT
timestamp	2007-10-31 03:04:54
map2	{{Location map+	USA California
{{Location map~	California	lat	38.45	long=-122.7	label=Santa Rosa	label_size=100	mark=Green pog.svg}}
{{Location map~	California	lat	36.6	long=-121.9	label=Monterey	label_size=100	mark=Green pog.svg}}
{{Location map~	California	lat	37.43	long=-121.77	mark=Bullseye1.png	marksize=40}}
relief	yes
width	250
float	right
caption	}}
anss-url	nc40204628
isc-event	13253322
magnitude
damage	Limited
intensity
depth	10 km
location
fault	Calaveras Fault
type	Strike-slip
countries affected	South Bay
Northern California
United States
casualties	None

|local-date = |local-time = 20:04 PDT |anss-url= nc40204628 |isc-event = 13253322 Northern California United States

The 2007 Alum Rock earthquake occurred on October 30 at 8:04 p.m. Pacific Daylight Time in Alum Rock Park in San Jose, in the U.S. state of California. It measured 5.6 on the moment magnitude scale and had a maximum Mercalli intensity of VI (Strong). The event was then the largest in the San Francisco Bay Area since the 1989 Loma Prieta earthquake, which measured 6.9 on the moment magnitude scale, but was later surpassed by the 2014 South Napa earthquake. Ground shaking from the Alum Rock quake reached San Francisco and Oakland and other points further north. Sixty thousand felt reports existed far beyond Santa Rosa, as far north as Eugene, Oregon.

Earthquake

The shock originated on the Calaveras Fault and ruptured an area of the fault for a length of about 5 km beginning at the hypocenter and extending southeast. There was no evidence of any surface rupture along the fault caused by the earthquake. David Oppenheimer, a seismologist at the United States Geological Survey (USGS), said that although the quake was felt as a strong jolt over a wide region, it was more significant because it caused stress changes in the Calaveras Fault and the nearby Hayward Fault.

Damage

Intensity VI (Strong) effects included broken windows and items that were knocked off store shelves, but the event caused no serious damage or injuries. Some parts of the Bay Area felt the rupture for up to 15 seconds.

Early warning

ElarmS, an earthquake early warning system, accurately predicted the quake seconds before it struck, correctly estimating the earthquake's magnitude to within 0.5 magnitude units using only three to four seconds' worth of data. Scientists with the California Integrated Seismic Network hope to refine the system to provide a 10-second warning in a similar quake to residents of Oakland and San Francisco.

References

Sources

References

"M 5.6 – 6 km NNE of East Foothills, California – Shakemap". United States Geological Survey.
(2008-09-23). "Magnitude 5.6 – SAN FRANCISCO BAY AREA, CALIFORNIA". United States Geological Survey.
Perlman, David. (2007-10-31). "Quake raises danger of more action on volatile Hayward Fault". [[San Francisco Chronicle]].
[http://www.physorg.com/news116608100.html Early warning system predicted shaking from Oct. 30 quake], ''[[PhysOrg.com]]'', December 11, 2007. Retrieved October 16, 2008.
National Geophysical Data Center / World Data Service (NGDC/WDS). (1972). "Significant Earthquake Database". [[National Geophysical Data Center]], [[National Oceanic and Atmospheric Administration.
(September 4, 2009). "PAGER-CAT Earthquake Catalog". United States Geological Survey.

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

earthquakes-in-california 2007-earthquakes 2007-natural-disasters-in-the-united-states 2007-in-california october-2007-in-the-united-states

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